<template>

  <div class="app-container">

    <h2 style="text-align: center;">发布新课程</h2>

    <el-steps :active="2" process-status="wait" align-center style="margin-bottom: 40px;">
      <el-step title="填写课程基本信息"/>
      <el-step title="创建课程大纲"/>
      <el-step title="最终发布"/>
    </el-steps>

    <el-button type="text" @click="openChapterDialog()">添加章节</el-button>

    <!-- 章节 -->
    <ul class="chanpterList">
      <li
        v-for="chapter in chapterVideoList"
        :key="chapter.id">
        <p>
          {{ chapter.title }}

          <span class="acts">
            <el-button style="" type="text" @click="openVideo(chapter.id)">添加小节</el-button>
            <el-button style="" type="text" @click="openEditChatper(chapter.id)">编辑</el-button>
            <el-button type="text" @click="removeChapter(chapter.id)">删除</el-button>
          </span>
        </p>

        <!-- 视频 -->
        <ul class="chanpterList videoList">
          <li v-for="video in chapter.children" :key="video.id">
            <p>{{ video.title }}
              <span class="acts">
                <el-button style="" type="text">编辑</el-button>
                <el-button type="text" @click="removeVideo(video.id)">删除</el-button>
              </span>
            </p>
          </li>
        </ul>
      </li>
    </ul>
    <div>
      <el-button @click="previous">上一步</el-button>
      <el-button :disabled="saveBtnDisabled" type="primary" @click="next">下一步</el-button>
    </div>
    <!-- 添加和修改章节表单 -->
    <el-dialog :visible.sync="dialogChapterFormVisible" title="添加章节">
      <el-form :model="chapter" label-width="120px">
        <el-form-item label="章节标题">
          <el-input v-model="chapter.title"/>
        </el-form-item>
        <el-form-item label="章节排序">
          <el-input-number v-model="chapter.sort" :min="0" controls-position="right"/>
        </el-form-item>
      </el-form>
      <div slot="footer" class="dialog-footer">
        <el-button @click="dialogChapterFormVisible = false">取 消</el-button>
        <el-button type="primary" @click="saveOrUpdate">确 定</el-button>
      </div>
    </el-dialog>
    <!-- 添加和修改课时表单 -->
    <el-dialog :visible.sync="dialogVideoFormVisible" title="添加课时">
      <el-form :model="video" label-width="120px">
        <el-form-item label="课时标题">
          <el-input v-model="video.title"/>
        </el-form-item>
        <el-form-item label="课时排序">
          <el-input-number v-model="video.sort" :min="0" controls-position="right"/>
        </el-form-item>
        <el-form-item label="是否免费">
          <el-radio-group v-model="video.free">
            <el-radio :label="true">免费</el-radio>
            <el-radio :label="false">默认</el-radio>
          </el-radio-group>
        </el-form-item>
        <el-form-item label="上传视频">
          <!-- TODO -->
        </el-form-item>
      </el-form>
      <div slot="footer" class="dialog-footer">
        <el-button @click="dialogVideoFormVisible = false">取 消</el-button>
        <el-button :disabled="saveVideoBtnDisabled" type="primary" @click="saveOrUpdateVideo">确 定</el-button>
      </div>
    </el-dialog>
  </div>
</template>
<script>
import chapterApi from '@/api/edu/chapter'
import videoApi from '@/api/edu/video'
export default {
  data() {
    return {
      saveBtnDisabled: false,
      courseId: '', // 课程id
      chapterVideoList: [],
      chapter: { // 封装章节数据
        title: '',
        sort: 0
      },
      video: {
        title: '',
        sort: 0,
        free: 0,
        videoSourceId: ''
      },
      dialogChapterFormVisible: false, // 章节弹框
      dialogVideoFormVisible: false // 小节弹框
    }
  },
  created() {
    if (this.$route.params && this.$route.params.id) {
      this.courseId = this.$route.params.id
      // 根据课程id查询章节和小节
      this.getChapterVideo()
    }
  },
  methods: {
    previous() {
      this.$router.push({ path: '/course/info/' + this.courseId })
    },
    next() {
      // 跳转到第二步
      this.$router.push({ path: '/course/publish/' + this.courseId })
    },
    getChapterVideo() {
      chapterApi.getAllChapterVideo(this.courseId).then(res => {
        this.chapterVideoList = res.data.chapterVideo
      })
    },
    // ==============================章节操作====================================
    // 删除章节
    removeChapter(chapterId) {
      this.$confirm('此操作将删除章节, 是否继续?', '提示', {
        confirmButtonText: '确定',
        cancelButtonText: '取消',
        type: 'warning'
      }).then(() => { // 点击确定，执行then方法
        // 调用删除的方法
        chapterApi.deleteChapter(chapterId).then(res => { // 删除成功
          // 提示信息
          this.$message({
            type: 'success',
            message: '删除成功!'
          })
          // 刷新页面
          this.getChapterVideo()
        })
      }) // 点击取消，执行catch方法
    },
    // 修改章节弹框数据回显
    openEditChatper(chapterId) {
      // 弹框
      this.dialogChapterFormVisible = true
      // 调用接口
      chapterApi.getChapter(chapterId).then(res => {
        this.chapter = res.data.chapter
      })
    },
    // 弹出添加章节页面
    openChapterDialog() {
      // 弹框
      this.dialogChapterFormVisible = true
      // 表单数据清空
      this.chapter.title = ''
      this.chapter.sort = 0
    },
    // 添加章节
    addChapter() {
      // 设置课程id到chapter对象里面
      this.chapter.courseId = this.courseId
      chapterApi.addChapter(this.chapter).then(res => {
        // 关闭弹框
        this.dialogChapterFormVisible = false
        // 提示
        this.$message({
          type: 'success',
          message: '添加章节成功!'
        })
        // 刷新页面
        this.getChapterVideo()
      })
    },
    // 修改章节的方法
    updateChapter() {
      chapterApi.updateChapter(this.chapter).then(res => {
        // 关闭弹框
        this.dialogChapterFormVisible = false
        // 提示
        this.$message({
          type: 'success',
          message: '修改章节成功!'
        })
        // 刷新页面
        this.getChapterVideo()
      })
    },
    saveOrUpdate() {
      if (!this.chapter.id) {
        this.addChapter()
      } else {
        this.updateChapter()
      }
    },
    // ==============================小节操作====================================
    // 删除小节
    removeVideo(id) {
      this.$confirm('此操作将删除小节, 是否继续?', '提示', {
        confirmButtonText: '确定',
        cancelButtonText: '取消',
        type: 'warning'
      }).then(() => { // 点击确定，执行then方法
        // 调用删除的方法
        videoApi.deleteVideo(id).then(res => { // 删除成功
          // 提示信息
          this.$message({
            type: 'success',
            message: '删除小节成功!'
          })
          // 刷新页面
          this.getChapterVideo()
        })
      }) // 点击取消，执行catch方法
    },
    // 添加小节弹框的方法
    openVideo(chapterId) {
      // 弹框
      this.dialogVideoFormVisible = true
      // 设置章节id
      this.video.chapterId = chapterId
    },
    // 添加小节
    addVideo() {
      // 设置课程id
      this.video.courseId = this.courseId
      videoApi.addVideo(this.video).then(res => {
        // 关闭弹框
        this.dialogVideoFormVisible = false
        // 提示
        this.$message({
          type: 'success',
          message: '添加小节成功!'
        })
        // 刷新页面
        this.getChapterVideo()
      })
    },
    saveOrUpdateVideo() {
      this.addVideo()
    }
  }
}
</script>
<style scoped>
.chanpterList{
    position: relative;
    list-style: none;
    margin: 0;
    padding: 0;
}
.chanpterList li{
  position: relative;
}
.chanpterList p{
  float: left;
  font-size: 20px;
  margin: 10px 0;
  padding: 10px;
  height: 70px;
  line-height: 50px;
  width: 100%;
  border: 1px solid #DDD;
}
.chanpterList .acts {
    float: right;
    font-size: 14px;
}

.videoList{
  padding-left: 50px;
}
.videoList p{
  float: left;
  font-size: 14px;
  margin: 10px 0;
  padding: 10px;
  height: 50px;
  line-height: 30px;
  width: 100%;
  border: 1px dotted #DDD;
}

</style>
